Method and apparatus for controlling transmission power in a potentially transmission gated or capped communication system

• US 6,373,823 B1
• Filed: 01/28/1999
• Issued: 04/16/2002
• Est. Priority Date: 01/28/1999
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Wheatley, Charles E. III, Chen, Tao, Ling, Fuyun, Sindhushayana, Nagabhushana, Holtzman, Jack M., Saints, Keith
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): Nguyen, Phuongchau Ba
• Application Number:
  US09/239,454
• Time in Patent Office: 1,174 Days
• Field of Search: 370/252, 455/69, 455/522
• US Class Current: 370/252
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/20 using error rate
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission

Abstract

A power control system for controlling the transmission power in a system wherein the transmission power may be gated or capped. The receiver employs a combination of closed loop and outer loop power control. The outer loop is frozen upon detection by the receiver that the signal has been capped or gated.

Claims

1. A power control system for controlling the transmission energy of signals from a remote transmitter, comprising:

closed loop power control means for generating closed loop power control commands in accordance with a comparison between a first received signal quality metric and a variable threshold;

an outer loop power control means for determining said variable threshold in accordance with a second received signal quality metric; and

detector means for suspending the operation of said outer loop control means in accordance with a determination that said remote transmitter is not responding to said power control commands in a predetermined fashion.

2. The power control system of claim 1 wherein said detector means suspends operation of said outer loop means upon in accordance with the detection of the gating of the transmission energy of signals from a remote transmitter in accordance with the received energy of said signals from said remote transmitter.

3. The power control system of claim 1 wherein said detector means suspends operation of said outer loop means upon in accordance with the detection of the capping of the transmission energy of signals from a remote transmitter in accordance with the absence of increased received energy of said signals from said remote transmitter in response to at least one power control command requesting an increase in energy of said signals.

4. The power control system of claim 1 wherein said outer loop power control means generates said variable threshold in accordance with a frame error rate metric.

5. The power control system of claim 4 wherein said outer loop power control means generates said variable threshold in accordance with said frame error rate metric and a decoder metric.

6. The power control system of claim 1 wherein said outer loop power control means generates said variable threshold in accordance with a fram error rate metric and the received energy of signals from said remote transmitter.

7. The power control system of claim 1 wherein said outer loop power control means generates said variable threshold in accordance with a fram error rate metric, a decoder metric and the received energy of signals from said remote transmitter.

8. A method for controlling transmission energy of signals from a remote transmitter, comprising the steps of:

generating closed loop power control commands in accordance with a comparison between a first received signal quality metric and a variable threshold;

determining said variable threshold in accordance with a second received signal quality metric; and

suspending the determination of said variable threshold in accordance with a determination that said remote transmitter is not responding to said power control commands in a predetermined fashion.

9. The method of claim 8 wherein said step of suspending the determination of said variable threshold is performed in accordance with the detection of the gating of the transmission energy of signals from said remote transmitter in accordance with the received energy of said signals from said remote transmitter.

10. The method of claim 8 wherein said step of suspending the determination of said variable threshold is performed in accordance with the detection of the capping of the transmission energy of signals from a remote transmitter in accordance with the absence of increased received energy of said signals from said remote transmitter in response to at least one power control command requesting an increase in energy of said signals.

11. The method of claim 8 wherein said step of generating said variable threshold is performed in accordance with a frame error rate metric.

12. The method of claim 11 wherein said step of generating said variable threshold is performed in accordance with said frame error rate metric and a decoder metric.

13. The method of claim 8 wherein said step of generating said variable threshold is performed in accordance with a frame error metric and the received energy of signals from said remote transmitter.

14. The method of claim 8 wherein said step of generating said variable threshold is performed in accordance with a frame error rate metric, a decoder metric and the received energy of signals from said remote transmitter.